Transition Networks Power Supply SPS 48V User Manual

COMPLIANCE INFORMATION  
UL Listed  
C-UL Listed (Canada)  
CISPR/EN55022 Class A  
48 VDC-to-12 VDC  
External Power Supply  
FCC Regulations  
This equipment has been tested and found to comply with the limits for a class A digital device, pursuant  
to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful  
interference when the equipment is operated in a commercial environment. This equipment generates,  
uses, and can radiate radio frequency energy and, if not installed and used in accordance with the  
instruction manual, may cause harmful interference to radio communications. Operation of this  
equipment in a residential area is likely to cause harmful interference, in which case the user will be  
required to correct the interference at the user’s own expense.  
SPS-48V  
USER’S GUIDE  
The TRANSITION Networks SPS-48V 48-to-12 VDC External Power Supply  
provides isolated 12 VDC output voltage from a 48 VDC external input voltage  
source to a media converter or similar devce.  
Canadian Regulations  
This digital apparatus does not exceed the Class A limits for radio noise for digital apparatus set out on  
the radio interference regulations of the Canadian Department of Communications.  
Le présent appareil numérique n'émet pas de bruits radioélectriques dépassant les limites applicables  
aux appareils numériques de la class A prescrites dans le Règlement sur le brouillage radioélectrique  
édicté par le ministère des Communications du Canada.  
European Regulations  
Warning  
This is a Class A product. In a domestic environment this product may cause radio interference in which  
case the user may be required to take adequate measures.  
Achtung !  
Dieses ist ein Gerät der Funkstörgrenzwertklasse A. In Wohnbereichen können bei Betrieb dieses Gerätes  
Rundfunkstörungen auftreten, in weichen Fällen der Benutzer für entsprechende Gegenmaßnahmen  
werantwortlich ist.  
Attention !  
Ceci est un produit de Classe A. Dans un environment domestique, ce produit risque de créer des  
interférences radioélectriques, il appartiendra alors à l’utilsateur de prende les measures spécifiques  
appropriées.  
Trademark Notice  
All registered trademarks and trademarks are the property of their respective owners.  
Copyright Restrictions  
© 2001 TRANSITION Networks.  
All rights reserved. No part of this work may be reproduced or used in any form or by any means –  
graphic, electronic, or mechanical – without written permission from TRANSITION Networks.  
Installation .................................2  
Maintenance ..............................4  
Technical Specifications.............6  
Compliance Information.............8  
 
33212.A  
Printed in the U.S.A.  
4.  
5.  
6.  
Connect +48-VDC terminal to 48-to-12 VDC External Power Supply  
terminal block control marked “+”. Turn terminal screw clockwise to  
secure.  
TECHNICAL SPECIFICATIONS  
Input  
Connect -48-VDC terminal to 48-to-12 VDC External Power Supply  
terminal block control marked “-”. Turn terminal screw clockwise to  
secure.  
Input Voltage  
Inrush Current  
Hold-Up Time  
48 VDC  
0.20 A (peak cold start)  
20 msec minimum at full load and nominal input  
voltage  
Connect ground terminal to 48-to-12 VDC External Power Supply  
terminal block control marked “chassis ground”. Turn terminal screw  
clockwise to secure.  
Isolation Voltage  
(Dielectric withstand) Meets IEC 960 for one minute.  
1,500 VAC:  
500 VAC:  
500 VAC:  
Output/Input  
Input/Safety GND  
Output/Safety GND  
Output  
Output Voltage  
Output Current  
Line Regulation  
Load Regulation  
Cross Regulation  
12 VDC  
0.8 A  
±0.5 % of all output within specified range  
±1.0 % at 20 % load to full-rated load  
±1.0 % maximum on any output change from 50 % to  
100 % rated load  
+
Transient Response  
Output voltage returns in less than 3 msec following a  
50 % load change  
-
GND  
Over Load Protection  
(OLP) When the average power rating exceeds 125%-  
150% of maximum power, output voltages reduced to  
a safe dissipation level; protects against short circuit of  
any output.  
Over Voltage Protection (OVP) 124 % ±8 % on output.  
Over Circuit Protection Withstands a continous short without damage; returns  
automatically to regulation upon removal of short.  
7.  
Ensure that external power source is powered ON.  
No Load Operation  
No damage to power supply when operating at no  
load.  
Overshoot Protection  
No voltage spike at power-on, power-off, or power  
failure.  
 
6.  
7.  
Carefully lift cover from External Power Supply.  
Locate fuse on 48-VDC Power Supply Module.  
MAINTENANCE  
Replacing Power Supply Module Fuse  
CAUTION: Wear a grounding device and observe electrostatic discharge  
precautions when replacing the fuse in the 48-to-12 VDC External Power  
Supply. Failure to observe this caution could result in damage to, and  
subsequent failure of, the 48-to-12 VDC External Power Supply.  
CAUTION: Replace fuse only with same size and rating. Failure to observe this  
caution could result in equipment damage.  
CAUTION: Ensure that power source is NOT powered when disconnecting  
power from, or connecting power to, the 48-to-12 External Power Supply.  
Failure to observe this caution could result in damage to, and subsequent  
failure of, the 48-to-12 External Power Supply and of any attached device.  
1.  
2.  
Ensure that external power source is powered OFF.  
Disconnect +48-VDC terminal from Media Conversion Center terminal  
block control marked “+” by turning terminal screw counter-clockwise.  
3.  
4.  
Disconnect -48-VDC terminal from Media Conversion Center terminal  
block control marked “-” by turning terminal screw counter-clockwise.  
Disconnect ground terminal from Media Conversion Center terminal  
block control marked “chassis ground” by turning terminal screw  
counter-clockwise.  
Fuse Holder  
Fuse  
5.  
Remove and retain four (4) screws that secure cover to External Power  
Supply.  
8.  
9.  
Carefully remove fuse from fuse holder.  
Install same size and rating replacement fuse in fuse holder.  
10. Carefully slide cover onto External Power Supply.  
11. Replace four (4) retained screws that secure cover to External Power  
Supply.  
12. Connect +48-VDC terminal to 48-to-12 VDC External Power Supply  
terminal block control marked “+”. Turn terminal screw clockwise to  
secure.  
13. Connect -48-VDC terminal to 48-to-12 VDC External Power Supply  
terminal block control marked “-”. Turn terminal screw clockwise to  
secure.  
14. Connect ground terminal to 48-to-12 VDC External Power Supply  
terminal block control marked “chassis ground”. Turn terminal screw  
clockwise to secure.  
15. Ensure that external power source is powered ON.  
 

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